<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Demo</title>
</head>
<body>
    <form action="#">
        <input type="button" value="Say Hello" id="helloButton">
    </form>
    <div id="responseOutput">
    </div>
    <script src="index.js"></script>
</body>
</html>